JPS60184833A - Production unit for film stuck corrugated board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing a film-attached corrugated board in which a 7° plastic film is attached to at least the front and back surfaces of the cardboard.

Cardboard is lightweight, inexpensive, and has appropriate strength, so it is widely used as a packaging material for boxes, etc. However, because it is poor in waterproof and moisture-proof properties, it has the disadvantage that it loses its strength extremely due to moisture absorption, and is easily stained. There is. One possible solution to this drawback is to attach a plastic film to the surface of the cardboard, but if it is hand-tied or similar in efficiency, the problem is that the cardboard becomes very expensive.

This invention solves the above problem, and aims to provide an apparatus that can manufacture corrugated board with a plastic film pasted on the surface by using a front liner base paper with a plastic film pasted on the surface. This is what I did.

That is, the manufacturing apparatus of this invention has a core 1 and a front liner 2.
In a corrugating machine that uses starch glue for bonding, a heat transfer belt 6 that circulates up and down the heating section 4 of the Gable 7 Acer and slides on the heating plate is provided on one part of the Gable 7 Acer, and the heat transfer belt is placed on top of the heat transfer belt 6. The corrugated cardboard structure F2 is mounted on a pulley 22 so as to accompany it, and the heat required for gelatinizing the starch paste is applied from the heating section 4 to the corrugated cardboard structure F2 via the heat transfer belt 6. It is.

The drawings show one embodiment of the present invention, and FIG. 2 shows a cross-sectional groove path of a corrugated board F manufactured by the apparatus of the present invention, in which a core 1 made of paper, front and back liners 2 made of paper, 3 are pasted together, and a plastic film 7.8 is pasted on each outer surface of the front and back liners 2 and 3. However, among these, a corrugated board with a plastic film 7 pasted on the outside surface of the front liner 2 is produced. This is a feature of the device of the present invention.

The plastic film here includes heat-meltable or stretch-reinforced polyethylene film.

Holi flobilene film, polyester film! PVC film, polystyrene film.

Polyamide film, polycarbonate film.

A polyimide film or the like can be used.

As the polyamide film, nylon 6 film, nylon 66 film, nylon 11 film, nylon 12 film, etc. can be used, and as the polyester film, polyethylene terephthalate film, polybutylene terephthalate film, etc. can be used. I can do it.

The manufacturing apparatus of the present invention will be explained based on FIG. 1. Reference numeral 9 denotes a roll stand for the core paper 1a, 10 a roll stand for the back liner paper 3a, and 11 a roll stand for the front liner paper 2a. Of these, front and back liner base paper 2a,
A heat-fusible film 7.8 is laminated on 3a by an extrusion method.

Such heat-fusible film-laminated paper may be commercially available or one that has been laminated with "paper and heat-fusible film" in a separate process, but when producing the corrugated board of the present invention, mill roll Using the paper fed out from the stand as a base material, part of the single 7 ace or the double 7
Immediately before introduction into a part of the aceter, the meltable film may be formed by extrusion lamination, or the melted film may be directly pressed onto paper as a base material. Note that depending on the lamination method or the type of plastic film, an adhesive may be present between the paper serving as the base material and the plastic film. There has never been an example in the past where such a heat-melt film laminated paper was directly used as a liner base paper in the production of corrugated board. The bonding process between the outer liner and the core is carried out in a double 7-piece machine under high heat of around 180°C and moderate pressure, as starch glue is usually used. As a result, the laminated film naturally suffers from melting problems, making it impossible to manufacture it as corrugated board.

For the single 7 Acer part S, the core base paper 1a is heated with a preheater and then transferred to two corrugated rolls 12.13.
After the corrugating rollers rotate to form a corrugated shape, starch paste is applied to the top of the corrugated layer by a glue roll 14.

On the other hand, the back liner base paper 3a with the film 8 laminated on its outer surface passes through a preheater, and is fed between the unheated press roll 15 and the corrugating roll 13, and the back liner base paper 3a is placed on the core. 1 is glued to the top of the corrugated board F1 to form a single-sided corrugated board F1.

In the instant bonding process using the corrugated rolls 13 and press rolls 15, heat is applied from the corrugated rolls and is not heated by the press rolls 15, so there is no effect of heat on the outer heat-fusible film 8. Although there is almost no change in the film due to the press, some traces of the press remain at the top of the step due to the pressure of the press. Such marks do not appear at all on the film 7 of the front liner 2 in some parts of the groove 7, and this point is one of the great advantages of the present invention.

The single-sided corrugated cardboard F1 fed out from the single 7 acer part S is coated with starch glue in the adhesive tank 16 by the glue roll 17 on the corrugated top of the core 9 before the single 7 acer part S, and then 7 Acer is rolled into one portion along with the front liner base paper 2a, and when both are combined, a corrugated cardboard structure F2 is formed.
is configured.

This starch paste is based on the invention of Steenhall, and is made by suspending and dispersing raw starch in a gelatinized starch solution. When heated, the raw starch gelatinizes and removes the water in the solution. Because it is absorbed and its viscosity rises rapidly, instant adhesion is achieved by heating.

Next, regarding the part of the Guburu 7 Acer, a heating section 4 and a cooling section 20 are provided under the cordating bell (18), just like the conventional corrugating machine, but unlike the conventional corrugating machine. A heat transfer belt 6 is provided in the heating section 4, and the heat required for gelatinizing the starch paste is applied to the corrugated cardboard structure F2 via the heat transfer belt 6. Further, the heat transfer belt 6 is hung on a pulley 22 so as to circulate around the heating section 4, and when the full dating belt 18 carries the corrugated cardboard structure F2 by friction, the corrugated cardboard structure F2 is transferred to the heat transfer belt. 6 is similarly circulated by friction.

In this case, with conventional heating devices, the surface film of the corrugated cardboard structure comes into contact with the surface of the heating plate of the heating section, which is maintained at a temperature of about 180°C, which not only melts the film and causes scratches, but also The friction between the board and the film makes it impossible to transport the corrugated structure. Furthermore, when the temperature of the heating section is lowered to prevent melting of the film, the starch paste becomes insufficiently gelatinized, resulting in poor lamination, and in any case, it is impossible to manufacture double-sided corrugated board.

In this case, for example, if a thin flat sheet of paper is fixed and laid as an intervening material on the upper surface of the heating plate 5, the corrugated cardboard structure will become impossible to transport due to the friction resistance with the film layer of the corrugated cardboard structure. Alternatively, in a configuration in which the inclusions are not formed into a belt shape and are simply moved together due to frictional resistance with the corrugated cardboard structure, the cost of the inclusions increases and operation costs become extremely high.

According to the device of the present invention, since the corrugated cardboard structure F2 is placed on the heat transfer belt 6, the corrugated cardboard structure F2 accompanies and heats the heat transfer belt 6 due to the friction between the plastic film 7 on the lower surface and the heat transfer belt 6. Passes over plate 5. Therefore, the corrugated cardboard structure F2 is transported smoothly by the cordating belt, and the film 7 on the lower surface of the corrugated cardboard structure F2 does not rub against the upper surface of the heating plate 5.
While passing over it, it remains in close contact with the heat transfer belt 6.

Therefore, even if the heating temperature of the heat transfer belt 6 to the film 7 is below its melting temperature, heat conduction is very effective. It is received while passing over the top, and due to its gelatinization, the
The front liner 2 is adhered to the corrugated top, and the corrugated cardboard structure F2 with completed adhesion is cooled in the next cooling section 20, and then cut into a predetermined size with a cutter 23, and the film-attached corrugated cardboard F is produced as a product. can.

It is desirable that the heat transfer belt 6 has appropriate heat conductivity for relaxing and transmitting heat, and has strength and durability to prevent breakage, and the material thereof is, for example, paper.

Examples include fibrous materials and heat-resistant synthetic resin films. Regarding the thickness, as a result of experiments on the bonding strength and the effect on the film layer under the condition that the heating temperature and speed in the field were hardly changed, the results were as follows: 0,
It was found that a thickness of about 2 mm to 7 mm is preferable. However, since this thickness varies depending on the material, cross-sectional shape, etc. of the belt 6 used, the appropriate thickness must be determined in advance through experiments.

As described above, this invention significantly exhibits the following effects.

1) By using a front liner base paper with a plastic film attached in advance, film-attached corrugated cardboard can be rationally manufactured without changing the conventional general corrugated board manufacturing process and efficiency. Therefore, this seed ball can be manufactured at low cost.

2) The side to which the plastic film is attached is the surface that enhances the moisture-proof, waterproof, and cosmetic properties of the cardboard, and the film surface is not melted or scratched and retains its cosmetic properties, making it a film with high commercial value. Bonded cardboard can be produced.

3) The apparatus of the present invention can be provided by making slight improvements to conventional general corrugating machines. Moreover, the apparatus of the present invention can be completed by making slight improvements to the general cordate machine currently in use. Therefore, it is possible to provide or complete the apparatus of the present invention at low cost, and this also makes it possible to manufacture film-bonded cardboard at low cost.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of the apparatus of the present invention, and FIG. 2 is a sectional view showing an example of film-bonded corrugated board produced by the apparatus of the present invention. S... Single 7 Acer part D... Double 7 Acer part 1... Core 1a... Core base paper 2... Front liner - 2a... Front liner base paper 3...
Back liner 3a...back liner base paper 4...heating section
5... Heating plate 6... Heat transfer belt 7... Plastic film patent applicant Ishizaki Sangyo Co., Ltd.

Claims (1)

[Claims] 1) Bonding the inner core and the front liner [This starch paste is placed in a corrugating machine that uses it, and the heated part is circulated up and down on a part of the Guburu 7 Acer on a heating plate. A heat transfer belt is provided that slides on the surface of the starch paste, and the heat transfer belt is placed on top of the belt (with a two-corrugated cardboard structure placed thereon and hung on a 7° leash so that the heat required for gelatinization of the starch paste is transferred from the heating section). 1. An apparatus for manufacturing film-attached corrugated cardboard, characterized in that it is configured to apply one corrugated cardboard structure via a heat belt.